and I think anyway that I should put a gnlcomposition in here, to keep
both streams in sync. Anyway, I feel that this is not achievable through
a gst-launch command-line, but would like to know if this feeling is
justified? Does anyone use a gst-launch command line to do such things?

Supplementary question: the remuxer.py from gst-python examples should
do this, but with some trickery (and I did not manage to get it to
successfully extract anything). Given its last real update dates back
from 2006, is it still considered as reference code?

You need to specify which stream you want for each gnlfilesource by
using the 'caps' property.
Ex : gnlfilesource caps="video/x-raw-yuv" ! ....

>
> and I think anyway that I should put a gnlcomposition in here, to keep
> both streams in sync. Anyway, I feel that this is not achievable through
> a gst-launch command-line, but would like to know if this feeling is
> justified? Does anyone use a gst-launch command line to do such things?

You don't need a gnlcomposition if you're only using one file (like
you're doing above).

>
> Supplementary question: the remuxer.py from gst-python examples should
> do this, but with some trickery (and I did not manage to get it to
> successfully extract anything). Given its last real update dates back
> from 2006, is it still considered as reference code?
>
> Regards,
> Olivier
>
>
>
>
>
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